Who said "Rules exist for a reason"?

This quote is attributed to Ove.

Rules exist for a reason - Ove

"Rules exist for a reason"

Ove

Character in A Man Called Ove

"A man can do a lot of things if he doesn't believe in himself."

"One shouldn't spend one's life on assumptions."

"People are basically decent, but there are a lot of them."

"Everything would be better if more people understood that sometimes you just have to let things be."